This past CodeForces global round ( Global Round 27 ) was the first rated Div. 1 in 3 months that was conveniently timed for me, a high school student on the West Coast of the US. Even then, I was at a party that went late the night before, so I was effectively taking this contest on 5 hours of sleep. Whatever. I breezed through A, B, and C. I encountered a little hiccup at D, but it wasn't too hard of a problem. Now I had more than 2 hours to work on any other problem and, spoiler alert, I didn’t solve anything. The first place I went wrong was underestimating the difficulty of E. Usually, I can use my intuition to guess some greedy for early problems (I literally guessed B and C in this round), but this has to stop once I reach a problem that's supposed to be hard. But the very notion that a problem is hard can actually change our perception on solving it. If I think a problem is hard, it becomes infinitely harder to motivate myself to find a solution for it. If it's be